Petrol Tap. At last we have a petrol tap for the Isetta manufactured by BMW and adapted for use in the Isetta by the “Isettadude” in the USA. It comes complete with an integral alloy sealing washer and seal so a fibre washer is not required with is product. Use the long type ( Product No 1102 Everbest Bullet shaped tap) control arm with this tap and also use an  R clip  ( Product No 58/4) which will allow the control arm  articulate without putting undue pressure on the seal face in other words its supposed to be loose otherwise it will leak every time you operate it